Documents disponibles écrits par cet auteur

Coordination number of the packing of ternary mixtures of spheres / L. Y. Yi in Industrial & engineering chemistry research, Vol. 50 N° 14 (Juillet 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 14 (Juillet 2011) . - pp. 8773-8785 Titre : Coordination number of the packing of ternary mixtures of spheres : DEM simulations versus measurements Type de document : texte imprimé Auteurs : L. Y. Yi, Auteur ; K. J. Dong, Auteur ; R. P. Zou, Auteur Année de publication : 2011 Article en page(s) : pp. 8773-8785 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Ternary  mixture Résumé : Coordination number is an important microscopic parameter in describing the packing of particles. However, little information is available for particle mixtures because of the difficulty of investigating them experimentally. This article presents a numerical study on the coordination numbers of a ternary packing system with size ratios of 24.4/11.6/6.4 by means of the discrete element method (DEM). Good agreement between the simulated and measured results was obtained, which confirms, at a particle scale, that DEM is capable of generating reliable results for structural analysis of particle packing. It was also found that the coordination number distribution of each of the cases considered can be described by the so-called Johnson SB function. The distribution parameters of the function were quantified based on the DEM simulation results so that the coordination number distributions corresponding to different contact types in this ternary packing system can be fully described. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24346918 [article] Coordination number of the packing of ternary mixtures of spheres : DEM simulations versus measurements [texte imprimé] / L. Y. Yi, Auteur ; K. J. Dong, Auteur ; R. P. Zou, Auteur . - 2011 . - pp. 8773-8785. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 14 (Juillet 2011) . - pp. 8773-8785 Mots-clés : Ternary  mixture Résumé : Coordination number is an important microscopic parameter in describing the packing of particles. However, little information is available for particle mixtures because of the difficulty of investigating them experimentally. This article presents a numerical study on the coordination numbers of a ternary packing system with size ratios of 24.4/11.6/6.4 by means of the discrete element method (DEM). Good agreement between the simulated and measured results was obtained, which confirms, at a particle scale, that DEM is capable of generating reliable results for structural analysis of particle packing. It was also found that the coordination number distribution of each of the cases considered can be described by the so-called Johnson SB function. The distribution parameters of the function were quantified based on the DEM simulation results so that the coordination number distributions corresponding to different contact types in this ternary packing system can be fully described. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24346918

DEM simulation of cake formation in sedimentation and filtration / K. J. Dong in Minerals engineering, Vol. 22 N° 11 (Octobre 2009) 

Public ISBD [article]  in Minerals engineering > Vol. 22 N° 11 (Octobre 2009) . - pp. 921–930 Titre : DEM simulation of cake formation in sedimentation and filtration Type de document : texte imprimé Auteurs : K. J. Dong, Auteur ; R. P. Zou, Auteur ; R.Y. Yang, Auteur Année de publication : 2009 Article en page(s) : pp. 921–930 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Liquid–solid  separation  Sedimentation  Filtration  Particle  packing  Discrete  element  method Résumé : This paper presents a DEM study of cake formation and growth in sedimentation and filtration processes with constant flow rate or pressure. The liquid flow is assumed to be one-dimensional and the motion of particles is three-dimensional. Various forces are included to determine the motion of particles, including the particle–particle contact forces, the van der Waals force and the particle–fluid interactions such as buoyancy, drag and lift forces. The effects of the material properties of particles and liquid and the operational conditions are examined. The structures of cakes are also analysed and the relationship between cake porosity and interparticle force is quantified. The microscopic analysis demonstrates that these variables affect the process and the cake structures through their effects on the gravity or cohesive force, which competes in controlling the formation of a cake. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509001010 [article] DEM simulation of cake formation in sedimentation and filtration [texte imprimé] / K. J. Dong, Auteur ; R. P. Zou, Auteur ; R.Y. Yang, Auteur . - 2009 . - pp. 921–930. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 22 N° 11 (Octobre 2009) . - pp. 921–930 Mots-clés : Liquid–solid  separation  Sedimentation  Filtration  Particle  packing  Discrete  element  method Résumé : This paper presents a DEM study of cake formation and growth in sedimentation and filtration processes with constant flow rate or pressure. The liquid flow is assumed to be one-dimensional and the motion of particles is three-dimensional. Various forces are included to determine the motion of particles, including the particle–particle contact forces, the van der Waals force and the particle–fluid interactions such as buoyancy, drag and lift forces. The effects of the material properties of particles and liquid and the operational conditions are examined. The structures of cakes are also analysed and the relationship between cake porosity and interparticle force is quantified. The microscopic analysis demonstrates that these variables affect the process and the cake structures through their effects on the gravity or cohesive force, which competes in controlling the formation of a cake. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509001010

Gas–solid flow and energy dissipation in inclined pneumatic conveying / S. B. Kuang in Industrial & engineering chemistry research, Vol. 51 N° 43 (Octobre 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 43 (Octobre 2012) . - pp. 14289–14302 Titre : Gas–solid flow and energy dissipation in inclined pneumatic conveying Type de document : texte imprimé Auteurs : S. B. Kuang, Auteur ; R. P. Zou, Auteur ; R. H. Pan, Auteur Année de publication : 2013 Article en page(s) : pp. 14289–14302 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Gas  solid Résumé : This article presents a numerical study of inclined pneumatic conveying using the combination of the discrete element model (DEM) for the particles and computational fluid dynamics (CFD) for the gas. In the numerical model, periodic boundary conditions (PBCs) are applied to both gas and particles in the conveying direction for computational efficiency. The validity of the model is first examined by comparing the calculated and measured results in terms of solids flow rate and gas pressure drop during pneumatic conveying with a pipeline inclination angle varying from 0° to 90°. On this basis, the effects of inclination angle, solids flow rate, and gas velocity on gas pressure are quantified. The contributions of different forces including the particle–wall friction force, particle gravitational force, and fluid–wall friction force to the pressure drop are examined. Finally, the energy dissipation as a result of interactions between particles, between particles and wall, between particles and fluid, between fluids, and between fluid and wall is studied in detail. The results show that the energy loss during steady-state inclined pneumatic conveying can mainly be attributed to particle–fluid energy dissipation, gravitational potential energy, particle–wall friction energy dissipation, and fluid–wall viscous energy dissipation. These energy dissipations vary significantly with inclination angle and flow regime. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie301894d [article] Gas–solid flow and energy dissipation in inclined pneumatic conveying [texte imprimé] / S. B. Kuang, Auteur ; R. P. Zou, Auteur ; R. H. Pan, Auteur . - 2013 . - pp. 14289–14302. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 43 (Octobre 2012) . - pp. 14289–14302 Mots-clés : Gas  solid Résumé : This article presents a numerical study of inclined pneumatic conveying using the combination of the discrete element model (DEM) for the particles and computational fluid dynamics (CFD) for the gas. In the numerical model, periodic boundary conditions (PBCs) are applied to both gas and particles in the conveying direction for computational efficiency. The validity of the model is first examined by comparing the calculated and measured results in terms of solids flow rate and gas pressure drop during pneumatic conveying with a pipeline inclination angle varying from 0° to 90°. On this basis, the effects of inclination angle, solids flow rate, and gas velocity on gas pressure are quantified. The contributions of different forces including the particle–wall friction force, particle gravitational force, and fluid–wall friction force to the pressure drop are examined. Finally, the energy dissipation as a result of interactions between particles, between particles and wall, between particles and fluid, between fluids, and between fluid and wall is studied in detail. The results show that the energy loss during steady-state inclined pneumatic conveying can mainly be attributed to particle–fluid energy dissipation, gravitational potential energy, particle–wall friction energy dissipation, and fluid–wall viscous energy dissipation. These energy dissipations vary significantly with inclination angle and flow regime. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie301894d